Hello Fatdcuk, thank you very much for your so quick help, I was afraid that my report would be lost among hundreds of others, since I imagine that you may be very busy sometimes on this forum! Here is the zip copy of the file wallpaper.exe (I hope I have done the zip process correctly!). I have used this file for many years to install Wallpaper on my successive computers. When I do a scan on this specific file, Malwarebytes does not detect any infection. When I do a whole scan of my computer after having deleted the quarantined infected component detected in Malwarebytes and after having uninstalled Wallpaper, but with the wallpaper.exe file still in my computer, Malwarebytes does not detect any infection. It is just when I install Wallpaper that Malwarebytes tells me that they are infected, it is very recent. Can it be caused by a recent update that makes Malwarebytes too "aggressive" so that it creates false positives now? Thank you very much again for your assistance. ALT WallpaperSetup.zip